/**
 *  Copyright (c) 1997-2013, www.tinygroup.org (luo_guo@icloud.com).
 *
 *  Licensed under the GPL, Version 3.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *       http://www.gnu.org/licenses/gpl.html
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package org.tinygroup.template.function;

import org.tinygroup.template.Template;
import org.tinygroup.template.TemplateContext;
import org.tinygroup.template.TemplateException;

import java.io.ByteArrayOutputStream;
import java.io.UnsupportedEncodingException;
import java.net.MalformedURLException;
import java.net.URL;

/**
 * Created by luoguo on 2014/6/9.
 */
public class ParseTemplateFunction extends AbstractTemplateFunction {

	public ParseTemplateFunction() {
		super("parse");
	}

	public Object execute(Template template, TemplateContext context,
			Object... parameters) throws TemplateException {
		if (parameters.length == 0 || !(parameters[0] instanceof String)) {
			notSupported(parameters);
		}
		ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
		String path = parameters[0].toString();
		try {
			if (!path.startsWith("/")) {
				URL url = new URL("file:" + template.getPath());
				URL newUrl = new URL(url, path);
				path = newUrl.getPath();
			}
			template.getTemplateEngine().renderTemplateWithOutLayout(path,
					context, outputStream);

			return new String(outputStream.toByteArray(), template
					.getTemplateEngine().getEncode());
		} catch (UnsupportedEncodingException e) {
			throw new TemplateException(e);
		} catch (MalformedURLException e) {
			throw new TemplateException(e);
		}

	}
}
